import math
from math import sqrt


def add(x, y):
    return x+y


def my_min(x, y):
    return x-y


def mul(x, y):
    return x*y


def div(x, y):
    return x/y


def exact_div(x, y):
    return x//y


def my_remainder(x, y):
    return x % y


def my_power(x, y):
    return x ** y


def my_sqr(x):
    return sqrt(x)


print(add(12, 15))
print(my_min(50, 20))
print(mul(10, 10))
print(div(20, 2))
print(exact_div(20, 2))
print(my_remainder(20, 3))
print(my_power(2, 3))
print(my_sqr(4))

